Polyethylene compositions and closures for bottles

a polyethylene composition and bottle technology, applied in the field of polyethylene compositions, can solve problems such as non-ideal organoleptic properties of resins, and achieve the effect of good balance of mechanical, processing and organoleptic properties

Active Publication Date: 2015-02-24
NOVA CHEM (INT) SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]The present invention provides caps and closures comprising a polyethylene composition made by a two reactor solution phase process and a single site catalyst. Plaques made from the polyethylene compositions have a good balance of mechanical, processing and organoleptic properties.

Problems solved by technology

However, the use of conventional catalyst systems typically produces significant amounts of low molecular weight polymer chains having high comonomer contents, which results in resins having non-ideal organoleptic properties.

Method used

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  • Polyethylene compositions and closures for bottles

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[0145]Mn, Mw, and Mz (g / mol) were determined by high temperature Gel Permeation Chromatography (GPC) with differential refractive index (DRI) detection using universal calibration (e.g. ASTM-D6474-99). GPC data was obtained using an instrument sold under the trade name “Waters 150c”, with 1,2,4-trichlorobenzene as the mobile phase at 140° C. The samples were prepared by dissolving the polymer in this solvent and were run without filtration. Molecular weights are expressed as polyethylene equivalents with a relative standard deviation of 2.9% for the number average molecular weight (“Mn”) and 5.0% for the weight average molecular weight (“Mw”). The molecular weight distribution (MWD) is the weight average molecular weight divided by the number average molecular weight, MW / Mn. The z-average molecular weight distribution is Mz / Mn. Polymer sample solutions (1 to 2 mg / mL) were prepared by heating the polymer in 1,2,4-trichlorobenzene (TCB) and rotating on a wheel for 4 hours at 150° C. i...

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Abstract

A dual reactor solution process gives high density polyethylene compositions containing a first ethylene copolymer and a second ethylene copolymer and which have good processability, toughness, and environmental stress crack resistance combined with good organoleptic properties. The polyethylene compositions are suitable for compression molding or injection molding applications and are particularly useful in the manufacture of caps and closures for bottles.

Description

FIELD OF THE INVENTION[0001]The present invention relates to polyethylene compositions that are useful in the manufacture of molded articles such as closures for bottles.BACKGROUND OF THE INVENTION[0002]Polymer compositions useful for molding applications, specifically the manufacture of caps and closures for bottles are well known. Screw closures for example, are typically made from polypropylene (PP) in order to achieve the necessary cap strength, however, an inner liner composed of a soft polymer is required to provide necessary seal properties. The soft inner liner can be made from ethylene / vinyl acetate (EVA), polyvinyl chloride (PVC), butyl rubber or other suitable material. The two-part cap is costly, and single part constructions are preferred to reduce cost.[0003]Accordingly, one-piece closures, such as screw caps have more recently been made from polyethylene resins. The use of high density resin is required if the closures are to have sufficient stiffness, while broader m...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C08F210/16C08L23/08C08F10/02
CPCC08L23/0815C08L23/08C08F10/02C08F210/16C08F210/14C08F2500/07C08F2500/10C08F2500/12C08F2500/13C08F2500/17C08L2203/10C08L2205/025C08L2207/062C08F2/001C08F4/65908C08F4/65912C08F4/6592C08F2500/04C08F2500/19C08F2500/05C08F2500/11
Inventor WANG, XIAOCHUANLACOMBE, YVESWEBER, MARK EDMUND
Owner NOVA CHEM (INT) SA
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